Namura .040 Over Bore Piston Kit for Polaris most 1996-2013 500 ATV/UTV 93mm

Namura .040 Over Bore Piston Kit for Polaris

This Namura .040 over bore piston kit provides a direct replacement piston and rings for rebuilding Polaris 500cc ATV and UTV engines from 1996 to 2013, featuring a 93mm bore size to restore lost compression and power.

Overview

This Namura .040 over bore piston kit is designed for Polaris 500 ATV and UTV models, offering a 93mm bore that increases displacement slightly over stock. It includes the piston, rings, wrist pin, and circlips for a complete top-end rebuild, making it an ideal choice for mechanics and DIY owners restoring engine performance.

Built For Performance

• Oversized .040 (1mm) bore for increased displacement and compression
• High-strength aluminum alloy construction for durability
• Precision-machined ring grooves for optimal ring seal
• Includes wrist pin and circlips for a complete kit
• Compatible with stock connecting rods and crankshaft

Specs At A Glance

Good To Know

Q: Do I need to re-plate the cylinder for this over bore piston? A: Yes, for a .040 over bore the cylinder must be bored and honed to the correct clearance by a qualified machine shop before installation.

Q: Can this kit be used with a stock carburetor? A: Yes, the slight increase in displacement typically does not require carburetor changes, but tuning may be needed for optimal performance.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.